xref: /kernel/linux/linux-5.10/crypto/algboss.c (revision 8c2ecf20) 
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Create default crypto algorithm instances.
4 *
5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
6 */
7
8#include <crypto/internal/aead.h>
9#include <linux/completion.h>
10#include <linux/ctype.h>
11#include <linux/err.h>
12#include <linux/init.h>
13#include <linux/kthread.h>
14#include <linux/module.h>
15#include <linux/notifier.h>
16#include <linux/rtnetlink.h>
17#include <linux/sched/signal.h>
18#include <linux/slab.h>
19#include <linux/string.h>
20
21#include "internal.h"
22
23struct cryptomgr_param {
24	struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
25
26	struct {
27		struct rtattr attr;
28		struct crypto_attr_type data;
29	} type;
30
31	union {
32		struct rtattr attr;
33		struct {
34			struct rtattr attr;
35			struct crypto_attr_alg data;
36		} alg;
37		struct {
38			struct rtattr attr;
39			struct crypto_attr_u32 data;
40		} nu32;
41	} attrs[CRYPTO_MAX_ATTRS];
42
43	char template[CRYPTO_MAX_ALG_NAME];
44
45	struct crypto_larval *larval;
46
47	u32 otype;
48	u32 omask;
49};
50
51struct crypto_test_param {
52	char driver[CRYPTO_MAX_ALG_NAME];
53	char alg[CRYPTO_MAX_ALG_NAME];
54	u32 type;
55};
56
57static int cryptomgr_probe(void *data)
58{
59	struct cryptomgr_param *param = data;
60	struct crypto_template *tmpl;
61	int err;
62
63	tmpl = crypto_lookup_template(param->template);
64	if (!tmpl)
65		goto out;
66
67	do {
68		err = tmpl->create(tmpl, param->tb);
69	} while (err == -EAGAIN && !signal_pending(current));
70
71	crypto_tmpl_put(tmpl);
72
73out:
74	complete_all(&param->larval->completion);
75	crypto_alg_put(&param->larval->alg);
76	kfree(param);
77	module_put_and_exit(0);
78}
79
80static int cryptomgr_schedule_probe(struct crypto_larval *larval)
81{
82	struct task_struct *thread;
83	struct cryptomgr_param *param;
84	const char *name = larval->alg.cra_name;
85	const char *p;
86	unsigned int len;
87	int i;
88
89	if (!try_module_get(THIS_MODULE))
90		goto err;
91
92	param = kzalloc(sizeof(*param), GFP_KERNEL);
93	if (!param)
94		goto err_put_module;
95
96	for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
97		;
98
99	len = p - name;
100	if (!len || *p != '(')
101		goto err_free_param;
102
103	memcpy(param->template, name, len);
104
105	i = 0;
106	for (;;) {
107		int notnum = 0;
108
109		name = ++p;
110
111		for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
112			notnum |= !isdigit(*p);
113
114		if (*p == '(') {
115			int recursion = 0;
116
117			for (;;) {
118				if (!*++p)
119					goto err_free_param;
120				if (*p == '(')
121					recursion++;
122				else if (*p == ')' && !recursion--)
123					break;
124			}
125
126			notnum = 1;
127			p++;
128		}
129
130		len = p - name;
131		if (!len)
132			goto err_free_param;
133
134		if (notnum) {
135			param->attrs[i].alg.attr.rta_len =
136				sizeof(param->attrs[i].alg);
137			param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
138			memcpy(param->attrs[i].alg.data.name, name, len);
139		} else {
140			param->attrs[i].nu32.attr.rta_len =
141				sizeof(param->attrs[i].nu32);
142			param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
143			param->attrs[i].nu32.data.num =
144				simple_strtol(name, NULL, 0);
145		}
146
147		param->tb[i + 1] = &param->attrs[i].attr;
148		i++;
149
150		if (i >= CRYPTO_MAX_ATTRS)
151			goto err_free_param;
152
153		if (*p == ')')
154			break;
155
156		if (*p != ',')
157			goto err_free_param;
158	}
159
160	if (!i)
161		goto err_free_param;
162
163	param->tb[i + 1] = NULL;
164
165	param->type.attr.rta_len = sizeof(param->type);
166	param->type.attr.rta_type = CRYPTOA_TYPE;
167	param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
168	param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
169	param->tb[0] = &param->type.attr;
170
171	param->otype = larval->alg.cra_flags;
172	param->omask = larval->mask;
173
174	crypto_alg_get(&larval->alg);
175	param->larval = larval;
176
177	thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
178	if (IS_ERR(thread))
179		goto err_put_larval;
180
181	return NOTIFY_STOP;
182
183err_put_larval:
184	crypto_alg_put(&larval->alg);
185err_free_param:
186	kfree(param);
187err_put_module:
188	module_put(THIS_MODULE);
189err:
190	return NOTIFY_OK;
191}
192
193static int cryptomgr_test(void *data)
194{
195	struct crypto_test_param *param = data;
196	u32 type = param->type;
197	int err = 0;
198
199#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
200	goto skiptest;
201#endif
202
203	if (type & CRYPTO_ALG_TESTED)
204		goto skiptest;
205
206	err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
207
208skiptest:
209	crypto_alg_tested(param->driver, err);
210
211	kfree(param);
212	module_put_and_exit(0);
213}
214
215static int cryptomgr_schedule_test(struct crypto_alg *alg)
216{
217	struct task_struct *thread;
218	struct crypto_test_param *param;
219	u32 type;
220
221	if (!try_module_get(THIS_MODULE))
222		goto err;
223
224	param = kzalloc(sizeof(*param), GFP_KERNEL);
225	if (!param)
226		goto err_put_module;
227
228	memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
229	memcpy(param->alg, alg->cra_name, sizeof(param->alg));
230	type = alg->cra_flags;
231
232	/* Do not test internal algorithms. */
233	if (type & CRYPTO_ALG_INTERNAL)
234		type |= CRYPTO_ALG_TESTED;
235
236	param->type = type;
237
238	thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
239	if (IS_ERR(thread))
240		goto err_free_param;
241
242	return NOTIFY_STOP;
243
244err_free_param:
245	kfree(param);
246err_put_module:
247	module_put(THIS_MODULE);
248err:
249	return NOTIFY_OK;
250}
251
252static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
253			    void *data)
254{
255	switch (msg) {
256	case CRYPTO_MSG_ALG_REQUEST:
257		return cryptomgr_schedule_probe(data);
258	case CRYPTO_MSG_ALG_REGISTER:
259		return cryptomgr_schedule_test(data);
260	case CRYPTO_MSG_ALG_LOADED:
261		break;
262	}
263
264	return NOTIFY_DONE;
265}
266
267static struct notifier_block cryptomgr_notifier = {
268	.notifier_call = cryptomgr_notify,
269};
270
271static int __init cryptomgr_init(void)
272{
273	return crypto_register_notifier(&cryptomgr_notifier);
274}
275
276static void __exit cryptomgr_exit(void)
277{
278	int err = crypto_unregister_notifier(&cryptomgr_notifier);
279	BUG_ON(err);
280}
281
282/*
283 * This is arch_initcall() so that the crypto self-tests are run on algorithms
284 * registered early by subsys_initcall().  subsys_initcall() is needed for
285 * generic implementations so that they're available for comparison tests when
286 * other implementations are registered later by module_init().
287 */
288arch_initcall(cryptomgr_init);
289module_exit(cryptomgr_exit);
290
291MODULE_LICENSE("GPL");
292MODULE_DESCRIPTION("Crypto Algorithm Manager");
293